Update taiki-e/install-action digest to 8c39981 (#1979) #5548

Job	Run time
Lint (ubuntu-latest)	34s
Build documentation (ubuntu-latest)	1m 10s
Lint (windows-latest)	2m 58s
Build and test (ubuntu-latest, 1.81)	5m 11s
Build and test (ubuntu-latest, stable)	3m 38s
Test archives with a target runner	2m 21s
Build and test (macos-14, 1.81)	4m 59s
Build and test (macos-14, stable)	2m 48s
Build and test (windows-latest, 1.81)	7m 49s
Build and test (windows-latest, stable)	7m 9s
Test archives with a runner (destination) (ubuntu-24.04, ubuntu-latest)	5s
Test archives with a runner (destination) (windows-latest, windows-latest)	22s
	39m 4s

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